A simile is a figure of speech in which the words “like” or “as” are used. A metaphor is a figure of speech where the terms of comparison are simply offered without the prepositions. In English at least, Hosea 7 is chock full of both types of comparisons. The nation of Israel is compared to at least five different things: (1) adulterers, (2) a heated oven, (3) an insufficiently baked cake, (4) a senseless dove, and (5) a bow that fails the archer.
With such a diverse selection of imagery, you would think the prophet would have no trouble making his point. But when hearts are hard enough, nothing gets through.